#define _CRT_SECURE_NO_WARNINGS 1

#include<iostream>
#include<vector>
using namespace std;

class Solution {
public:
	int singleNumber(vector<int>& nums) {
		int count = 3;
		int ret = 0;
		while (count--)
		{
			for (auto e : nums)
			{
				ret ^= e;
			}
		}
		return ret;
	}
};



int main()
{
	vector<int> v1(10, 13);
	for (auto e : v1)
	{
		cout << e << " ";
	}
	cout << endl;

	vector<int> v2(v1.begin(), v1.end());
	for (auto e : v2)
	{
		cout << e << " ";
	}
	cout << endl;
	return 0;
}

